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Acoustic waveguide based on cascaded Luneburg lens
Liuxian Zhao1, Timothy Horiuchi1, Miao Yu1
1Institute for Systems Research, University of Maryland, College Park, Maryland, 20742, USA lzhao128@umd.edu, timmer@umd.edu, mmyu@umd.edu.
JASA Express Letters
|September 26, 2022
Summary
This study introduces the acoustic Luneburg Lens (ALL) for acoustic wave guiding. Cascaded ALLs effectively focus and collimate acoustic waves, demonstrating a novel waveguide design.
Area of Science:
- Acoustics
- Wave Propagation
- Metamaterials
Background:
- Acoustic Luneburg Lenses (ALLs) offer unique wave manipulation capabilities.
- Guiding acoustic waves with precise control remains a challenge in acoustics.
Purpose of the Study:
- To investigate the acoustic Luneburg Lens (ALL) as a framework for acoustic wave propagation.
- To propose and demonstrate an acoustic waveguide utilizing cascaded ALLs for focusing and collimation.
Main Methods:
- Designing ALLs with continuously varying refractive index using lattice unit cells and graded filling ratios.
- Fabricating a cascaded ALL waveguide device using additive manufacturing techniques.
- Conducting numerical simulations, theoretical calculations, and experimental validation.
Main Results:
- The cascaded ALL waveguide successfully demonstrated acoustic wave focusing and collimation.
- Experimental results closely matched numerical simulations and theoretical predictions.
- The graded filling ratio in lattice unit cells enabled continuous refractive index variation.
Conclusions:
- The acoustic Luneburg Lens provides a viable design framework for acoustic wave guiding.
- Cascaded ALLs are effective for creating acoustic waveguides with enhanced focusing and collimation properties.
- Additive manufacturing is a suitable technique for fabricating such acoustic devices.
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